396ci LT4, YSI and 15lb of boost dyno result :(
03-26-2010, 04:55 AM
#81
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The supercharger will probably provide about ten times the volume of air than even the largest workshop compressor. SO again, its good and important to fix these leaks. But it will have minimal impact on performance.
03-26-2010, 10:37 AM
#82
Code:
Time TP Boost RPM AFR W R 79.841 100 9.0 5375 11.6 0 0 79.950 100 8.8 5521 11.6 0 0 80.059 100 10.1 5620 11.6 0 0 80.169 100 9.5 5770 11.5 0 0 80.278 100 9.7 5888 11.5 0 0 80.387 100 11.0 6010 11.4 0 0 80.496 100 11.1 6139 11.4 0 0 80.605 100 11.5 6261 11.4 0 0 80.715 100 11.9 6376 11.5 0 0 80.824 100 12.2 6496 11.5 0 0 80.933 100 12.0 6621 11.5 0 0 81.042 100 13.3 6711 11.5 0 0 81.151 100 13.8 6790 11.4 0 0 81.261 100 14.7 6871 11.2 0 0 81.370 100 14.7 6926 11.3 0 0 81.479 100 15.1 6857 11.5 0 0
03-26-2010, 11:09 AM
#83
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Interesting. Mine shows no dust. But nearly every time, I also see a slight dip in boost usually around 6500rpm.
This had occured with virtually every build Ive had !!!
This had occured with virtually every build Ive had !!!
03-26-2010, 02:12 PM
#84
That's interesting. If there's no slip, it could be that the air demand of the engine simply rise quicker at that point than the air supply rate of the supercharger. Roots blowers show a dip in boost near the torque peak for the same reason.
03-26-2010, 04:14 PM
#85
Take the hydra rev out. I had that in my old setup and it cost me over 80RWHP.
I made 700RWHP with a stock intake and ported stock heads. Smae YSI with 15 lbs of boost. The car should be in the 750 to 800 rwhp. I would lean in toward the rev kit. post a graph so we can see.
My machines said the only thing he could figure is that the rev kit was causing some sort of weird harmonics in the valve train.
I made 700RWHP with a stock intake and ported stock heads. Smae YSI with 15 lbs of boost. The car should be in the 750 to 800 rwhp. I would lean in toward the rev kit. post a graph so we can see.
My machines said the only thing he could figure is that the rev kit was causing some sort of weird harmonics in the valve train.
I know I am not a LT1 but, I would have ran 9.5 to 1 compression pistons.
04-22-2010, 01:21 PM
#86
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did a pressure chech at the dyno today. 17 psi before the afterercooler and 12psi at the intake. 5psi drop accross the aftercooler 
.
I am going to change the cooler with a bigger one.Anybody knows how much 700cfm in HP?
.I am going to change the cooler with a bigger one.Anybody knows how much 700cfm in HP?
04-22-2010, 01:32 PM
#87
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Just fit the biggest one you can. I dont believe cfm figures give the true picture. An IC might flow a lot of air...but does it also have sufficient cooling capacity ?
05-06-2010, 05:13 AM
#88
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last dyno run with a new intercooler It gained about 1 psi.its rated 700cfm which is not enough but I thought I give it a try since I already have it.bought it long time ago of ebay 
http://www.youtube.com/watch#!v=5WS3...eature=channel
http://www.youtube.com/watch#!v=5WS3...eature=channel
Last edited by kazdevil; 07-28-2010 at 01:57 AM. Reason: youtube link added.
05-06-2010, 11:30 AM
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nop, nothing else changed.The plan now is get an intercooler that flow something over 1500cfm and fit the 8'' crank pulley. all that will be done after a cam change.Does anyone have k&n air filters flow numbers?The one I have fitted is 4'' x 6" X 9".
05-11-2010, 05:28 PM
#95
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I just got an answer of K&N.The filter I have is part# RD-1460, and it flows 1187 CFM.The only filter They have with a 4” flange that will flow at least 1500 CFM is
RC-5171, which will flow 1655 CFM.
http://www.knfilters.com/search/prod...x?Prod=RC-5171
RC-5171, which will flow 1655 CFM.
http://www.knfilters.com/search/prod...x?Prod=RC-5171
12-29-2010, 03:57 PM
#96
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update solid roller cam fitted.Cam specs are 236/247 .632/.668 114 (+4) .Bullet VS 3100 solid roller springs and Ti retainers.gain wasnt much.Rev limit kept at 6700 RPM. IAT 27-30 c. same spark timing.Next step is bigger intercooler.
Last edited by kazdevil; 12-29-2010 at 04:43 PM.
12-29-2010, 04:25 PM
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I don't remember the OP being concerned with emissions or idle quality. If those are a factor, they by all means, put a peanut cam in it.
A YSi on big cubes with big heads will make big power with a big cam. All the race cars running YSi's are running monster cams.
To put it bluntly, with all other things the same, you WILL lose power with a baby cam in it.
A YSi on big cubes with big heads will make big power with a big cam. All the race cars running YSi's are running monster cams.
To put it bluntly, with all other things the same, you WILL lose power with a baby cam in it.
I really dont understand why the OP or anybody would not listen to you. OP I think those numbers are pretty decent. I say be happy with what you got and not tear into the motor and up the boost. Your Cr is low but take advantage of that.
12-29-2010, 04:32 PM
#98
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I don't remember the OP being concerned with emissions or idle quality. If those are a factor, they by all means, put a peanut cam in it.
A YSi on big cubes with big heads will make big power with a big cam. All the race cars running YSi's are running monster cams.
To put it bluntly, with all other things the same, you WILL lose power with a baby cam in it.
A YSi on big cubes with big heads will make big power with a big cam. All the race cars running YSi's are running monster cams.
To put it bluntly, with all other things the same, you WILL lose power with a baby cam in it.
It seems to make more power and torque everywhere. I suspect that even with less lift it would still make similar results and be easier on the valvetrain.
I'll likely be fitting a milder cam to mine too.....big cams really arent needed to make power with boost.
12-29-2010, 04:49 PM
#99
Some or all of that could be due to better valvetrain stability or more aggressive lobes associated with the solid roller conversion. It's not really apples to apples.
5 psi loss from the SC to the plenum is WAY high. Bell intercoolers told me the rule of thumb is to get losses down to less than 10% boost, which I was able to achieve with a few minor mods (larger MAF, larger TB, larger IC). If a 1 psi reduction in losses gained 40 hp, how much is the next 3 psi reduction going to bring?
Mike
5 psi loss from the SC to the plenum is WAY high. Bell intercoolers told me the rule of thumb is to get losses down to less than 10% boost, which I was able to achieve with a few minor mods (larger MAF, larger TB, larger IC). If a 1 psi reduction in losses gained 40 hp, how much is the next 3 psi reduction going to bring?
Mike
12-29-2010, 05:07 PM
#100
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TBH, I dont think Ive ever seen a system with such high losses. Something would need to be incredibly **** for that to be the case.
But the psi drop doesnt tell all. With my previous IC there was barely 1-2psi pressure drop across it. It didnt cool for **** though.
But camshafts are such a grey area. IMO bigger isnt always better. For an out and out drag car perhaps making a big number is all that matters. But for most others, a good wide spread of power is more important.
Ive yet to be convinced that big cams with lots of overlap really are the way forward with any form of FI.
But the psi drop doesnt tell all. With my previous IC there was barely 1-2psi pressure drop across it. It didnt cool for **** though.
But camshafts are such a grey area. IMO bigger isnt always better. For an out and out drag car perhaps making a big number is all that matters. But for most others, a good wide spread of power is more important.
Ive yet to be convinced that big cams with lots of overlap really are the way forward with any form of FI.